nothing so complicated as linear velocity, in fact, it didn't ask us about speed at all. all you want to find here is the length of the arc subtended by an angle of 20 degrees on a circle of radius 40 inchesEx 2) A pendulum swings through an angle of 20 degrees each second. If the pendulum is 40 inches long, how far does the tip move each second?
Not sure on this one. I remember something about Linear velocity and/or angular velocity but i could be completely off.